Examine source code of RadikoUIExtension

{
  "manifest_version": 2,
  "name": "RadikoUIExtension",
  "version": "1.2.0",
  "description": "radikoのUIを拡張します。",
  "options_ui": {
    "page": "options/option.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://radiko.jp/*"
      ],
      "js": [
        "module.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "contents/*"
  ],
  "permissions": [
    "storage"
  ]
}